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Bubble coalescence principle in saline water
Danlong Li1,2, Rogerio Manica3, Zhixiang Chen2,3
1School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
Summary
Bubble coalescence in saline water transitions from delayed to rapid bursting. This depends on surface deformation and ion excess, not just ion type, enabling control over bubble lifetime for engineering applications.
Area of Science:
- Fluid dynamics
- Surface science
- Physical chemistry
Background:
- Bubbles in saline water are crucial for engineering processes due to their extended lifetimes.
- Understanding bubble coalescence dynamics in salty solutions is key to optimizing these applications.
Purpose of the Study:
- To investigate the transition from delayed bubble coalescence to rapid bursting in saline solutions.
- To identify the key factors governing this transition and quantify critical parameters.
Main Methods:
- Analysis of combined influences of surface deformation and ion surface excess on bubble coalescence.
- Quantification of ion transfer content required for instant coalescence.
- Numerical modeling to determine critical values for predicting bubble dynamics.
Main Results:
- A transition from delayed coalescence to rapid bursting (within ~1 ms) was observed in salty solutions.
- The phenomenon is governed by the interplay of surface deformation and ion surface excess.
- A consistent upper limit of ion transfer content for instant coalescence was quantified.
- Numerical ranges and critical values for bubble behaviors were determined.
Conclusions:
- Bubble coalescence in saline water is regulated by surface deformation and ion surface excess.
- Findings provide a basis for controlling bubble coalescence time in technological applications.
- The study offers insights into the fundamental principles of bubble dynamics in ionic solutions.
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